A list of singular/plural pairs for use in formalizations.

\begin{forthel}
  [synonym belong/-s]
  [synonym bound/-s]
  [synonym cardinal/-s]
  [synonym class/-es]
  [synonym contain/-s]
  [synonym divide/-s]
  [synonym divisor/-s]
  [synonym domino/-es]
  [synonym element/-s]
  [synonym factor/-s]
  [synonym file/-s]
  [synonym function/-s]
  [synonym infimum/infima]
  [synonym integer/-s]
  [synonym inverse/-s]
  [synonym involution/-s]
  [synonym lattice/-s]
  [synonym lie/-s]
  [synonym map/-s]
  [synonym member/-s]
  [synonym number/-s]
  [synonym ordinal/-s]
  [synonym pair/-s]
  [synonym person/-s]
  [synonym point/-s]
  [synonym predecessor/-s]
  [synonym preserve/-s]
  [synonym prime/-s]
  [synonym rank/-s]
  [synonym reduct/-s]
  [synonym relation/-s]
  [synonym set/-s]
  [synonym sequence/-s]
  [synonym shave/-s]
  [synonym square/-s]
  [synonym subset/-s]
  [synonym successor/-s]
  [synonym superset/-s]
  [synonym supremum/suprema]
  [synonym surject/-s]
  [synonym system/-s]
\end{forthel}
